Question 1162716
.


The only correct formula is  (5).  


The rest are incorrect.


Calculate  10!  on your own and  DO  NOT  disturb the tutors with such miserable questions without necessity.



Also,  it is a  BAD  STYLE  to come to the forum with such questions.



<H3> - - - This forum is not a psychic clinic. - - - </H3>